:root {
    --bg-color: #0d1117;
    --card-bg: rgba(255, 255, 255, 0.03);
    --border-color: rgba(255, 255, 255, 0.1);
    --accent-color: #c084fc;
    --text-main: #f0f6fc;
    --text-sub: #8b949e;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
}

.container { width: 100%; margin: 0 auto; padding: 60px 24px; max-width: 800px; }

header { text-align: center; margin-bottom: 60px; }
.site-title { font-size: 0.8rem; letter-spacing: 0.5em; text-transform: uppercase; color: var(--text-sub); margin-bottom: 25px; }

.account-switcher { display: inline-flex; background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 100px; padding: 4px; }
.switch-btn { background: transparent; border: none; color: var(--text-sub); padding: 10px 20px; border-radius: 100px; cursor: pointer; font-size: 0.85rem; transition: 0.3s; }
.switch-btn.active { background: var(--accent-color); color: #000; font-weight: 600; }

.avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    flex-shrink: 0;
}

.section-profile { display: flex; align-items: center; gap: 30px; }
.profile-info h2 { font-size: 1.8rem; margin-bottom: 8px; }
.bio { color: var(--text-sub); font-size: 0.9rem; }

.divider { height: 1px; background: linear-gradient(90deg, transparent, var(--border-color), transparent); margin: 40px 0; }
.label { font-size: 0.7rem; color: var(--accent-color); letter-spacing: 0.2em; margin-bottom: 20px; font-weight: 700; text-transform: uppercase; }

.sns-grid { display: grid; grid-template-columns: repeat(1, 1fr); gap: 18px; }
.sns-item {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--card-bg);
    padding: 24px 20px;
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    transition: 0.3s;
    font-size: 0.9rem;
}
.sns-item:hover { border-color: var(--accent-color); transform: translateY(-2px); }
.sns-item svg { width: 18px; height: 18px; color: var(--accent-color); }

.achievements-list { display: grid; gap: 15px; }
.achievement-card { padding: 20px; border-radius: 12px; background: var(--card-bg); border: 1px solid var(--border-color); }
.achievement-card h3 { font-size: 1rem; margin-bottom: 5px; }
.achievement-card p { font-size: 0.85rem; color: var(--text-sub); }

.fade-in-up { animation: fadeInUp 0.6s cubic-bezier(0.2, 1, 0.3, 1) forwards; }
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
    .section-profile { flex-direction: column; text-align: center; }
    .sns-grid { grid-template-columns: 1fr; }
}